Audrina (surname unknown) is a sex trafficking victim who was rescued by Detective Fin Tutuola. She ended up returning to pimp T-Mac when she couldn't support herself, only to still face brutality all over again.
She called Fin, but because of her coming across a murdered black girl, Ruby Brown, who was in a trash heap near T-Mac's brothel. She knew Fin would care for a girl of color in a district with prostitution more than most cops. It paid off, as not only was Ruby identified and revealed to be in the Catholic school district, Ruby's killer, Joseph Thagard, was tracked for her murder and more murders of children whose parents were immigrants, proving they were killed to send their parents back to their home countries without a child as an American citizen, which is called the "anchor baby" policy. (SVU: "Anchor")